Frequencies for first 10,000 rows of toxscren variable in nhamcsed2013 dataset :

 Toxicology |
     screen |      Freq.     Percent        Cum.
------------+-----------------------------------
         No |      9,606       96.06       96.06
        Yes |        394        3.94      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 7 Nov 2016